http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29383
Bill Long <longb at cray dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |longb at cray dot com --- Comment #6 from Bill Long <longb at cray dot com> 2011-07-22 17:53:49 UTC --- Since most other compilers support ieee_arithmetic now, the lack of support in gfortran is becoming a portability issue. Simple test case with 4.6.1: > cat t1.f90 program test use,intrinsic :: ieee_arithmetic real :: x read *, x if (ieee_is_nan(x)) then print *, "Nan" else print *, "Not NaN" end if end program test > gfortran t1.f90 t1.f90:2.35: use,intrinsic :: ieee_arithmetic 1 Fatal Error: Can't find an intrinsic module named 'ieee_arithmetic' at (1)